9999*9999+1999用脱式简便计算
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/04 03:10:07
![9999*9999+1999用脱式简便计算](/uploads/image/z/475297-25-7.jpg?t=9999%2A9999%2B1999%E7%94%A8%E8%84%B1%E5%BC%8F%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97)
9999*9999+1999用脱式简便计算
9999*9999+1999
用脱式简便计算
9999*9999+1999用脱式简便计算
9999*9999+1999
=9999*(10000-1)+1999
=99990000-9999+1999
=99990000-8000
=99982000
=(10000-1)(10000-1)+1999
=10000*10000-10000-10000+1+1999
=100000000-20000+2000
=99982000
=(10000-1)(10000-1)+1999
=10000*10000-10000-10000+(1+1999)
=100000000-20000+2000
=99982000